int sd=0;
int sdz=0;
void setup() {
  // put your setup code here, to run once:
  //pinMode(A2,INPUT_PULLUP);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  sd=analogRead(20);sdz=map(sd,0,1024,0,100);
  Serial.println(sdz);
  delay(1000);
}

